CN112374736A - Physical strengthening method and forming die for multi-curved surface and large arch high silicate glass - Google Patents
Physical strengthening method and forming die for multi-curved surface and large arch high silicate glass Download PDFInfo
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- CN112374736A CN112374736A CN202011241505.9A CN202011241505A CN112374736A CN 112374736 A CN112374736 A CN 112374736A CN 202011241505 A CN202011241505 A CN 202011241505A CN 112374736 A CN112374736 A CN 112374736A
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- silicate glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/012—Tempering or quenching glass products by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0305—Press-bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
Abstract
The application relates to a physical strengthening method and a forming die of multi-curved-surface and large-arch high silicate glass, which comprises the following steps: (a) forming a silicate glass sample; (c) preheating a silicate glass sample; (d) carrying out physical tempering on the preheated silicate glass sample; (e) finally, the tempered silicate glass sample piece is sent to a lower die, the upper die is controlled to descend according to the arch height of the silicate glass product, the silicate glass sample piece is pressed, high-temperature resistant isolation mesh cloth is respectively paved on the upper die and the lower die, and high-temperature resistant isolation materials are uniformly sprayed on the isolation mesh cloth; (f) and cooling the pressed silicate glass sample to form the silicate glass product. This application is through last mould and bed die cooperation with silicate glass sample compression moulding, so can keep the cubic distribution of physics toughened glass granule, wear resistance, fish tail to endure and thermal shock resistance, and the silicate glass goodness of fit, the radian index of accomplishing of preparation are excellent.
Description
Technical Field
The application relates to silicate glass, in particular to a physical strengthening method and a forming die for multi-curved-surface and large-arch high silicate glass.
Background
Silicate glass is an amorphous material and has excellent properties such as thermal stability, high strength, high hardness, high transmittance and the like. The product has wide application in the fields of electronic products, buildings, automobiles, rail transit, aviation, aerospace and the like. In view of the increasing demand of products for the strength property of glass, the existing silicate glass usually needs to be strengthened in order to meet the requirement of high strength of the glass.
When the existing silicate curved glass is physically strengthened, the glass is heated to be close to the softening temperature of the glass, the glass at high temperature is conveyed to the area of a forming mold by a roller belt, the glass reaches the softening point at high temperature, the glass is formed by dead weight on the forming mold to form a radian, and then air (or other media) is blown to the two sides together with the mold to uniformly and rapidly cool the glass, so that the physical toughening is completed.
In the course of implementing the present application, the applicant has found that at least the following technical problems exist in the prior art:
1. when the thick silicate glass is heated and formed, the central temperature of the glass cannot reach the softening point, the energy is wasted by continuously heating, the service life of the toughening furnace is shortened, and the glass cannot be softened and formed by self weight;
2. when the silicate glass with smaller size is heated and formed, the silicate glass cannot be softened and formed due to the small self weight;
3. the forming radian of the glass with large arch height has great randomness, and the radian and the goodness of fit after forming are difficult to control to correspond to the theoretical appearance;
4. silicate glass is in direct contact with a mold, burning and mold marks are easily generated on the edge of the silicate glass, and when the temperature of the silicate glass rises, the upper heating system in a tempering furnace is easy to have wastes such as dust, scraps and the like falling on the surface of the silicate glass, so that pits are formed after tempering is completed to influence optics;
5. the silicate curved glass physically strengthened according to the prior method has the problems of lower strength, uneven stress, easy deformation and burn on the surface, and incapability of strengthening multi-curved and large-arch glass.
Disclosure of Invention
The embodiment of the application provides a physical strengthening method and a forming die for multi-curved-surface and large-arch high silicate glass, and solves the problems that the silicate curved-surface glass strengthened by the existing physical strengthening method is uneven in surface stress, easy to burn and incapable of being processed into multi-curved-surface and large-arch high silicate glass.
In order to solve the above technical problem, the present application is implemented as follows:
in a first aspect, a method for physically strengthening a multi-curved, large-arch high silicate glass is provided, which comprises the following steps: (a) forming a silicate glass sample; (c) preheating a silicate glass sample; (d) carrying out physical tempering on the preheated silicate glass sample; (e) finally, the tempered silicate glass sample piece is sent to a lower die, the upper die is controlled to descend according to the arch height of the silicate glass product, the silicate glass sample piece is pressed, high-temperature resistant isolation mesh cloth is respectively paved on the upper die and the lower die, and high-temperature resistant isolation materials are uniformly sprayed on the isolation mesh cloth; (f) and cooling the pressed silicate glass sample to form the silicate glass product.
In a first possible implementation manner of the first aspect, in the step (a), the silicate glass sample is soda-lime-silica glass, aluminosilicate glass, lithium-aluminosilicate glass, or high borosilicate glass.
In a second possible implementation of the first aspect, the release material includes a mixed powder of at least one of silica, magnesium oxide, zinc stearate, magnesium carbonate, china clay powder, and boric acid powder.
In a third possible implementation manner of the first aspect, in the step (c), the preheating temperature of the silicate glass sample piece is 500-.
In a fourth possible implementation manner of the first aspect, in the step (d), the physical tempering temperature of the silicate glass sample piece is 650-.
In a fifth possible implementation manner of the first aspect, in the step (e), the temperature of the upper mold is 550-700 ℃, and the waiting time for pressing on the silicate glass sample piece is 10-60 s.
In a sixth possible implementation manner of the first aspect, in the step (f), the silicate glass sample is cooled by using a cooling fan.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the cooling pressure of the cooling fan is 3000-15000 Pa.
In an eighth possible implementation of the first aspect, the silicate glass-like piece is preheated and tempered in a physical tempering furnace.
In a second aspect, there is provided a forming mold applied to the method for physically strengthening a multi-curved, large-arch high silicate glass according to any one of the first aspect, comprising: the top of the lower die is provided with a bearing surface, and the middle part of the bearing surface is provided with a forming groove; the upper die is movably arranged above the lower die and is provided with a pressing surface corresponding to the forming groove, and the pressing surface is an arc surface; the high-temperature mesh cloth is arranged on the bearing surface and the pressing surface; the isolation material is arranged on the high-temperature mesh cloth; and the heating system is arranged on the lower die and the upper die.
Compared with the prior art, the application has the advantages that:
the utility model provides a many curved surfaces, physics of heavy-arch height silicate glass reinforce method and forming die, it heats silicate glass appearance spare to the lower mould of forming die again after the softening point earlier, then control the upper mould decline and suppress on silicate glass appearance spare, the upper mould through forming die cooperates with the lower mould and carries out the compression moulding with silicate glass appearance spare, so can keep the cubic distribution of physics toughened glass granule, wear resistance, the fish tail is endured and thermal shock resistance can, and the silicate glass goodness of fit, the radian index of preparation completion is excellent, especially can solve the difficult problem that current physics tempering can't process many curved surfaces, heavy-arch height glass, opened up new application scene for the application of physics toughened glass. Simultaneously this application still lays the isolation screen cloth on last mould and bed die to evenly spray high temperature resistant barrier material on the isolation screen cloth, so can reduce defects such as burn and pockmark and produce, guaranteed glass surface appearance quality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of the steps of a first embodiment of a method for physically strengthening a multi-curved, high crown silicate glass of the present application;
fig. 2 is a schematic view of a molding die of a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In a first embodiment of the present application, please refer to fig. 1, which is a flowchart illustrating steps of a method for physically strengthening a multi-curved, large-arch silicate glass according to the first embodiment of the present application; as shown, the method S for physically strengthening a multi-curved, high-crown silicate glass includes the following steps S1 to S5, wherein:
and S1, forming a silicate glass sample.
Specifically, the silicate glass is selected, a part with no defect on the surface is picked, then the silicate glass is cut into the theoretical shape of a product by using a diamond numerical control machine, then the silicate glass is subjected to numerical control edging, the edge part of the silicate glass is rounded, the glass is uniformly chamfered after the numerical control edging, no burr is generated, and the end surface has no scratch and white mark, and then the silicate glass is put into a strong acid corrosive agent, such as HF, HNO3 and water according to the mass ratio (4-10 wt%): (85-95 wt%) reacting for 50-90min under the condition of heating mixed corrosive agent to 30-60 ℃, and washing the surface of silicate glass by deionized water after the reaction is finished, thus forming a silicate glass sample. The silicate glass sample may be soda-lime-silica glass, aluminosilicate glass, lithium-aluminosilicate glass, or high borosilicate glass, but not limited thereto.
S2, preheating the silicate glass sample.
Specifically, a silicate glass sample piece is placed on a transmission roller way, the position of the silicate glass sample piece is calibrated and positioned through a positioning column, then the silicate glass sample piece is conveyed into a preheating region in a physical tempering furnace through the transmission roller way, the physical tempering furnace is started, the preheating temperature of the preheating region is set to be 650 plus materials and 740 ℃, for example, 650 ℃, 700 ℃ or 740 ℃, the silicate glass sample piece is preheated, and meanwhile, the preheating time is set to be 120 plus materials and 300s, for example, 300s, 210s or 120 s.
And S3, performing physical tempering on the preheated silicate glass sample.
Specifically, after the preheating is completed, the silicate glass sample piece is continuously conveyed to a physical toughening area in the physical toughening furnace through a roller way, the toughening temperature of the physical toughening area is set to be 500-fold-600 ℃, for example, 500 ℃, 550 ℃ or 600 ℃, the silicate glass sample piece is toughened, and meanwhile, the toughening time is set to be 370-fold-800 s, for example, 800s, 585s or 370 s.
And S4, finally, feeding the toughened silicate glass sample piece onto a lower die, controlling the upper die to descend according to the arch height of the silicate glass product, pressing the silicate glass sample piece, wherein high-temperature-resistant isolation mesh cloth is respectively paved on the upper die and the lower die, and high-temperature-resistant isolation materials are uniformly sprayed on the isolation mesh cloth.
Specifically, high-temperature-resistant isolation mesh cloth is paved on an upper die and a lower die of a forming die respectively, and high-temperature-resistant isolation materials are uniformly sprayed on the isolation mesh cloth. The isolating material can be selected from one or more of silicon dioxide, magnesium oxide, zinc stearate, magnesium carbonate, clay powder and boric acid powder. And the temperature of the upper mold is heated to 550-700 ℃, such as 550 ℃, 625 ℃ or 700 ℃ in advance, then the toughened silicate glass sample is sent to the lower mold, the height is lowered according to the arch height requirement of the glass product, the silicate glass sample is pressed on the upper surface of the silicate glass sample, and the pressing waiting time is 10-60s, such as 10s, 35s or 60 s.
And S5, cooling the pressed silicate glass sample to form the silicate glass product.
Specifically, after the silicate glass sample is molded, the upper mold is lifted, the lower mold and the silicate glass sample are conveyed to a cooling area through a conveyor belt, the silicate glass sample is cooled by a cooling fan, and the cooling pressure of the cooling fan is set to 3000-15000Pa, such as 3000Pa, 9000Pa or 15000Pa, so as to form the silicate glass product.
For the existing physical strengthening method for strengthening silicate curved glass, silicate glass is heated to a temperature above a softening point, and then self-weight forming is carried out on a mould, so that when the silicate glass with thicker thickness is heated and formed, the central temperature of the silicate glass cannot reach the softening point, energy is wasted due to continuous temperature rise, the service life of a toughening furnace is shortened, the silicate glass cannot be softened and self-weight formed, when the silicate glass with smaller size is heated and formed, the self-weight forming cannot be softened and self-weight forming is carried out due to small self-weight, and the forming radian of the silicate glass with large arch height has great randomness, and the radian and goodness of fit after forming are difficult to control to correspond to the theoretical appearance.
However, in the physical strengthening method S for multi-curved-surface and large-arch silicate glass of this embodiment, when the multi-curved-surface and large-arch silicate glass is strengthened, a silicate glass sample is prepared first, and is strengthened after being preheated, so that the glass reaches a glass softening point, and then is conveyed to a lower mold of a forming mold, an upper mold is controlled to descend and is pressed on the silicate glass sample, and the silicate glass sample is pressed and formed by matching the upper mold and the lower mold, so that the advantages of bulk distribution, wear resistance, scratch tolerance and thermal shock resistance of the physical toughened glass particles can be maintained, and the prepared silicate glass has excellent indexes of goodness of fit and radian, and particularly, the problem that the existing physical toughening cannot process multi-curved-surface and large-arch silicate glass can be solved, and a new application scenario is opened for the application of the physical toughened glass. Meanwhile, the upper die of the embodiment is preheated before descending, so that when the upper die is contacted with the surface of the silicate glass sample piece, the surface of the silicate glass sample piece is uniformly heated, and uniform surface stress is formed.
Moreover, when the silicate curved glass is strengthened by the existing physical strengthening method, the silicate glass is in direct contact with a mold, burning and mold marks are easily generated on the edge, and the upper heating system in the toughening furnace is easy to have excess matters such as dust, scraps and the like falling on the surface of the glass when the temperature of the glass is raised, so that pits are formed after the toughening is finished to influence the optics. However, this embodiment lays the isolation screen cloth on last mould and bed die to evenly spray high temperature resistant barrier material on the isolation screen cloth, so can reduce defects such as burn and pockmark and produce, guaranteed glass surface appearance quality.
In a second embodiment of the present application, please refer to fig. 2, which is a schematic diagram of a forming mold according to the second embodiment of the present application; as shown in the figure, the forming mold 1 of the present embodiment is mainly applied to the physical strengthening method of the multi-curved surface, large arch silicate glass of the first embodiment, and the forming mold 1 includes a lower mold 2, an upper mold 3, a high temperature mesh 4, an isolation material 5 and a heating system 6. The lower mold 2 has a bearing surface 21 on the top, and a forming groove 211 in the middle of the bearing surface 21, and the lower mold 2 is used to bear the silicate glass sample 7. The lower mold 2 is in conformity with the shape of the silicate glass sample 7, for example, if the silicate glass sample 7 is circular, the lower mold 2 is also circular, but not limited thereto.
The upper mold 3 is movably disposed above the lower mold 2, and here, the upper mold 3 can be relatively close to and far away from the lower mold 2. The upper die 3 is provided with a pressing surface 31 corresponding to the forming groove 211, the pressing surface 31 is an arc surface, the high-temperature mesh 4 is arranged on the bearing surface 21 and the pressing surface 31, and the isolating material 5 is arranged on the high-temperature mesh 4 to reduce the generation of defects such as burn and pockmark in the pressing forming process. The heating system 6 is disposed on the lower mold 2 and the upper mold 3 for heating the surfaces of the lower mold 2 and the upper mold 3, specifically, the heating pipe of the heating system 6 is laid in the lower mold 2 and the upper mold 3, and the heating system 6 controls the heating pipe to uniformly heat the bearing surface 21 of the lower mold 2 and the pressing surface 31 of the upper mold 3, so as to ensure that the surface of the silicate glass sample 7 is uniformly heated, so that uniform surface stress is formed.
When the forming mold 1 of the present embodiment is used, the heating system 6 heats the carrying surface 21 of the lower mold 2 and the pressing surface 31 of the upper mold 3 in advance, then the silicate glass sample 7 is conveyed to the carrying surface 21 and is covered on the forming groove 211, the upper mold 3 is controlled to descend, the pressing surface 31 of the upper mold 3 is abutted on the upper surface of the silicate glass sample 7 to press the silicate glass sample 7, and the silicate glass sample 7 is recessed into the forming groove 211 to form the silicate glass with a curved surface and a large arch height.
To sum up, the application provides a many curved surfaces, method and forming die are reinforceed to physics of heavy-arch high silicate glass, it heats silicate glass sample spare to the lower mould of forming die again after the softening point earlier, then control the upper mould decline and suppress on silicate glass sample spare, the upper mould through forming die cooperates with the lower mould and carries the compression moulding of silicate glass sample spare, so can keep the cubic distribution of physics toughened glass granule, wear resistance, the fish tail is endured and thermal shock resistance can, and the silicate glass goodness of accomplishing of preparation, the radian index is excellent, especially can solve the difficult problem that current physics tempering can't process many curved surfaces, heavy-arch high glass, open up new application scenario for the application of physics toughened glass. Simultaneously this application still lays the isolation screen cloth on last mould and bed die to evenly spray high temperature resistant barrier material on the isolation screen cloth, so can reduce defects such as burn and pockmark and produce, guaranteed glass surface appearance quality.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A physical strengthening method of multi-curved surface and large arch high silicate glass is characterized by comprising the following steps:
(a) forming a silicate glass sample;
(c) preheating the silicate glass sample;
(d) carrying out physical tempering on the preheated silicate glass sample piece;
(e) finally, the tempered silicate glass sample piece is sent to a lower die, the upper die is controlled to descend according to the arch height of a silicate glass product, and the silicate glass sample piece is pressed, wherein high-temperature-resistant isolation mesh cloth is paved on the upper die and the lower die respectively, and high-temperature-resistant isolation materials are uniformly sprayed on the isolation mesh cloth;
(f) cooling the pressed silicate glass sample to form the silicate glass article.
2. The method for physically strengthening a multi-curved, high-arch high-silicate glass according to claim 1, wherein in the step (a), the silicate glass sample is soda-lime-silica glass, aluminosilicate glass, lithium-aluminosilicate glass, or high-borosilicate glass.
3. The method of physically strengthening a multi-curved, tall arch silicate glass according to claim 1, wherein the spacer material comprises a mixed powder of at least one of silica, magnesium oxide, zinc stearate, magnesium carbonate, china clay powder and boric acid powder.
4. The method as claimed in claim 1, wherein the pre-heating temperature of the silicate glass sample in step (c) is 500-600 ℃.
5. The method as claimed in claim 1, wherein the physical tempering temperature of the silicate glass sample piece in the step (d) is 650-740 ℃.
6. The method as claimed in claim 1, wherein the temperature of the upper mold in step (e) is 550-700 ℃, and the waiting time for pressing the silicate glass sample piece is 10-60 s.
7. The method of physically strengthening a multi-curved, tall arch silicate glass according to claim 1, wherein in step (f), the silicate glass sample is cooled by a cooling fan.
8. The method as claimed in claim 7, wherein the cooling pressure of the cooling blower is 3000-15000 Pa.
9. The method of physically strengthening a multi-curved, tall arch silicate glass according to claim 1, wherein the silicate glass sample is preheated and tempered in a physical tempering furnace.
10. A forming mold applied to the method for physically strengthening a multi-curved, high-arch silicate glass according to any one of claims 1 to 9, comprising:
the top of the lower die is provided with a bearing surface, and the middle part of the bearing surface is provided with a forming groove;
the upper die is movably arranged above the lower die and is provided with a pressing surface corresponding to the forming groove, and the pressing surface is an arc surface;
the high-temperature screen cloth is arranged on the bearing surface and the pressing surface;
the isolation material is arranged on the high-temperature mesh cloth;
and the heating system is arranged on the lower die and the upper die.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011241505.9A CN112374736A (en) | 2020-11-09 | 2020-11-09 | Physical strengthening method and forming die for multi-curved surface and large arch high silicate glass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011241505.9A CN112374736A (en) | 2020-11-09 | 2020-11-09 | Physical strengthening method and forming die for multi-curved surface and large arch high silicate glass |
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Application publication date: 20210219 |